| DOI | Resolve DOI: https://doi.org/10.1016/j.molstruc.2003.10.051 |
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| Author | Search for: Lees, R. M.; Search for: Mollabashi, M.; Search for: Xu, Li-Hong; Search for: Lock, M.; Search for: Winnewisser, B. P.; Search for: Lu, Z.-F.; Search for: Johns, J. W. C.1 |
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| Affiliation | - National Research Council of Canada. NRC Steacie Institute for Molecular Sciences
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| Format | Text, Article |
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| Subject | Coriolis coupling; CO-stretching; Fourier transform infrared spectra; Internal rotation; Level-crossing resonances; Methanol |
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| Abstract | The Fourier transform infrared (FTIR) spectrum of the 2[nu]8 overtone band of the CO-stretching vibrational mode of CH3OH has been investigated in the 5-[mu]m region at a spectral resolution of 0.0048 cm-1 (1/MOPD) and a higher pressure-path-length product than heretofore. Assignments are reported for high-K 2[nu]8 subbands in the ground state (n=0) of the [nu]12 torsion, and for 2[nu]8+[nu]12-[nu]12 (n=1) and 2[nu]8+2[nu]12-2[nu]12 (n=2) torsionally excited combination subbands. Upper-state [upsilon]8=2 term values have been fitted to series expansions in powers of J(J+1) to obtain J-independent substate origins defining the torsion-K-rotation structure of the overtone state. Perturbations due to Coriolis and asymmetry resonances have been observed and characterized, as well as J-localized level-crossing resonances arising principally from interactions with the [upsilon]7=2 overtone state of the in plane CH3-rocking mode and the ([upsilon]7,[upsilon]8)=(1,1) combination state. Differences between [upsilon]8=2 and [upsilon]8=1 term values have been used to generate a predicted map of the weak 2[nu]8-[nu]8 CO-stretching hot band. The hot band underlies the main [nu]8 fundamental in the 10-[mu]m region, so is of significance to the determination of the fundamental line intensities. A number of the weak hot-band lines have been observed in the 10-[mu]m FTIR spectrum. |
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| Publication date | 2004-06-30 |
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| In | |
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| Language | English |
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| NPARC number | 12328008 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 16fb114d-1a38-46f1-aa20-46278684a147 |
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| Record created | 2009-09-10 |
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| Record modified | 2020-04-17 |
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